AND TIIKIR TRANSFOKMATIONS. 7 



The species of this jrcnus arc few in number, and of moderate size. They appear to bo subject in a remark- 

 able degree to gynandromorphism, a considerable number of instances of this kind having been recorded by 

 different authoi-s, wliich I have collected in a memoir read before the Entomological Society of London ; in which 

 I have also described and figured some very interesting individuals reared by Mr. House, being hybrids between 

 S. ocellatus and S. populi, which are the only instances hitherto recorded of a similar result produced by the 

 forced imion of the sexes of distinct species. One of these is represented in our Plate I, fig. 10, partially 

 exhibiting the dentated margin of the wing, and the reddened base of the hind wings of the latter species, and an 

 incipient eye-like spot, as in S. ocellatus. 



SPECIES 1.— S.MERINTHUS OCELLATUS. THE EYED IIAWK-MOTH. 



Plalci. fig. 1— ;i. 

 SvNONYMFS. — Sphiiix occllotus, Linn.THS, Donovan, I5rit. Ins. vol. Sinerinthus ocellatus, Latrcillc. Curtis, Diit. Knt. y\. 462. 



8, pi. 269. Albin, pi. 8. Harris, Aurelian, pi. "1, f. a — i. Wilkes, 

 pi. 24. 



Wood, Inil. Ent. pi. -4, fig. 7. Duncan, Brit. Moths, pi. :!, fig. 1. 

 Spliiiuc salicis, lliibuer, pi. U>, fig. 23. 

 J'iKmias salicis, lliibri. (Vciv,. bck. Sclim.) 



This handsome insect varies in the expanse of its wings from 21 to nearly 3^ inclies. The fore wings are of 

 a pale rosy ash colour, variegated with chocolate brown, a large patch internally angulated being placed in tlu; 

 middle, and extending to the hind margin ; between this and the extremity of the wings are several undulated 

 brown bars, and the extremity is also brown, the apex itself being pale. The hind wings are of a fine rose-pink 

 colour, gradually shaded off to grey along the margin, and niarlu;d near the anal angle with a large black spot, 

 in which is a pale blue ocellus, the middle being of a slaty black hue. The fore wings have the posterior margin 

 almost entire, with the exception of a rather deep sinus near the hinder angle, giving the wings an angulated 

 appearance ; the hind wings arc also almost entire, with the anal angle slightly produced. The thorax is marked 

 above with a large patch of chocolate brown. 



The caterpillar is very pale green, with the minute tubercles and eight oblique white bars on each side, while 

 the spiracles are of a rosy brown colour, and the head is bordered with yellow. It chiefly feeds upon the willow 

 and sallow, but is occasionally found on the apple, sloe, peach, and almond. It appears in the autumn, and 

 changes to a chrysalis in September, and the moth bursts forth to life at the end of the following Slay. It is 

 widely distributed throughout England, and is by no means rare ; although in Scotland it is very seldom met with. 



SPECIES 2.— SMERIXTIIUS POPULI. THE POPLAR HAWK-.MOTH. 



Plate i. fig. 4—6. 



SvNONVMEs. — Sphinx Populi, Linna;us, Haworth, Donovan, 7, pi. 

 241. Albin, pi. 57. Wilkes, pi. 25. Harris, Aurelian, pi. 33, fig. 

 a— g. 



Smerinthus Populi, Laireillc ; Stephens ; Wood, Ind. Ent. t. 4, 

 f. 9. Duncan, Brit. Butt. pi. 3, fig. 2. 

 Laolhot Populi, Fabricius, Leach. 

 Polyptychus Populi, Uiibner ( Verz. bek. Schmet.) 



The expansion of the wings varies from three to nearly four and one-third inches. They are of a pale lilac-grey, 

 with a broad central bar succeeded by several undulated stripes, and the extremity of a greenish-brown, the first 

 being much darker towards the hind margin of the win^s ; the veins, and especially the oblique vein closing the 

 disooidal cell, p.ale whitish ; the base of the hind wings is broadly ferruginous. All the wings have tlie apical 

 margin almost regularly scolloped, and the anal angle of the hind wings is scarcely produced : the thorax and 

 abdomen are entirely of a pale lilacy.grey. The males have the markings of the fore wings generally darker 



